If I had my own podcast, today’s edition would involve speaking at length about how guns, despite their popular perception as a significant threat to our peace as a species, are actually a fairly antiquated, barbaric, uncreative, inefficient, unreliable, expensive, easily-deterred method of delivering widespread harm. The main useful factor, the only one, is that user operation could not be simpler.
This is why the kind of people who end up doing this sort of a thing with a gun are invariably mentally insane; you really need to be unhinged to set your situational constraints to be “this needs to be as easy as possible to use, simpler than a remote control” and “it does not matter that my weapon makes the loudest noise possible and I’ll certainly be identified among a crowd and caught later” and “it’s okay that it’s hard to use on people who are running away” and “I don’t mind dumping a shitload of money on my weapon and I don’t even care that obtaining such a weapon is somewhat likely to raise enough suspicion to alert law enforcement about what I’m about to do, never mind about the concealment issues”, among other things.
All things considered: he hit over sixty people? In a gas-cloud-filled dark room? It must be pointed out that is a nearly impossible result. It would not be something a Navy SEAL could reliably pull off. You are far more likely to be killed by lightning, etc.